Tag: March 2008 Issue
These items have all been tagged with the tag "March 2008 Issue", You can see other tags in the Tag CloudPumps & Systems, March 2008
Suppose, for a moment, that you are lounging on a beach somewhere in the vicinity of the equator. If you were to draw side by side two lines in the sand, both heading due north, they will appear parallel. Although our brains will see them as parallel, they are not and—if extended—will eventually intersect at the magnetic North Pole. Often pumps operating in parallel can fool us into thinking that the expected flow will be much greater than the actual flow.Pumps & Systems, March 2008
Few would dispute that variable frequency drives (VFDs) save energy, but the exact amount depends on the system. Hydraulically speaking, the main difference between a variable frequency (speed) drive and a discharge valve is that a VFD only changes a pump curve, while a valve only changes a system curve. A pump operates at the intersection between its H-Q curve and a system curve, and a change in either moves the operating point to a new intersection.
Pumps & Systems, March 2008
It required only a couple notes of the haunting soundtrack to signal an imminent shark attack in the movie Jaws. As the theme began to swell, it became obvious that someone was going to “get it.” It would be nice to have a sixth sense that allowed us to hear "warning" music in daily situations. Condition monitoring systems provide a means of sensing when sharks are skulking toward your critical machines.
Pumps & Systems, March 2008
Market Overview
Rotary pumps belong to the positive displacement (PD) pump family, which moves fluid using the principles of rotation. Rotary pumps are designed with small clearances between rotating parts which trap the fluid at the inlet port and force it through the discharge port into the system. Because of its design, the pumps operate at a relatively moderate speed to minimize slippage from the discharge side back to the suction side. Rotary pumps are subject to erosion if operated at high speed. Liquid slips reduce their efficiency.
Pumps & Systems, March 2008
Many items must be considered when designing pump station control systems with power requirements, level control method and control panel location often among the most important.
Pumps & Systems, March 2008
Outdated water systems are pumping beyond their original specifications, resulting in inefficient operation, higher maintenance and operation costs and the potential for a system shutdown. This article takes a look at updating the controls and pumps for a water system.
Pumps & Systems, March 2008
Changing traditional industry ways of thinking can help usher in the plant of the future.
In only a couple of years, the focus on energy efficiency has gone from blurred to steely-eyed. Green business practice is now a necessity, and organizations must find the best way to transition to this new reality. There are many opinions and approaches on "how we get there," and each one will have its own merits. A journey of a thousand miles starts with a single step, and making the right steps in the beginning will hasten the achievement of energy efficient goals.
Pumps & Systems, March 2008
As the name suggests, Winter Park, CO is a haven for winter weather fanatics. The city occupies 7.5-sq mi about an hour's drive northwest of Denver. Located in the heart of the Rocky Mountains, Winter Park provides visitors and residents opportunities for skiing, snowboarding, sledding, snowshoeing and more in the winter and hiking, mountain biking and fishing in the summer. The town also features more than 30 restaurants and a host of specialty stores and small niche shops.
Pumps & Systems, March 2008
Soils with high concentrations of clay and silt can wreak havoc on construction sites, drain pipes, sewers and pumps. Users working with soils might want to consider geotextiles as a preventive maintenance alternative.
Soil erosion isn't just a problem for farmers, Niagara Falls and the Grand Canyon. Most construction projects have to contend with the effects of water on excavations-not only as a consequence of rainfall runoff but also from ground water intrusion. The mud common to most jobsites at one point or another-tracking over roads and clogging drainage ditches and storm sewers-has lead to the need for more effective control mechanisms that are "user friendly" and low cost. Textiles have been used for centuries to try to filter out the mud and let the water drain away; some original wellpoints used lamp wick and burlap to separate the water from the soil.
Pumps & Systems, March 2008
Water, unimpeded, flows to the lowest possible point. (No rocket science here.) However, in many situations, this is not only a point where the water is not desirable, but it is also a point where the presence of notable volumes of water markedly interfere with human activity and even create specific hazards (as in excavations at construction sites, mining operations and numerous other activities in low-lying areas.). For example, the movement and accumulation of water to an excavation can create unstable conditions in the surrounding soils and-at the very least-impede necessary activities. In practice, the removal of unwanted water, in most situations, is complicated by the accumulation of suspended solids like mud and sand, as well as a wide variety of other particulate matter collected by moving water. The resulting slurry creates a tough, abrasive and sometimes corrosive environment for any type of pumping equipment.
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